英语就是这样( 80 ) Past continuous Tense 过去进行式

过去进行式（Past continuous Tense）怎样用？ 看看以下的例子，你是否会理解或看出它的用法？

I was sleeping when some knocked the door.

We were enjoying the TV show when someone shouted from outside.

He was driving when the accident happened.

I was walking when I met him.

以上的每个句子，是不是有两个动作？但两个动作的时间持久性是不同，一个动作的时间比较长，另一个动作的时间是比较短或突兀性的。 这就是过去进行式（Past continuous Tense）用法的关键之一。

在上面句子的过去进行式（Past continuous Tense）的文法，动作时间比较长的，我们用上了 was sleeping, were enjoying, was driving 和was walking；在动作时间比较短，我们用过去式（PAST TENSE）

I was sleeping ( 动作时间比较长) when some knocked the door.( 突兀性)

We were enjoying the TV show (动作时间比较长)when someone shouted from outside.( 突兀性)

He was driving( 动作时间比较长)when the accident happened.(突兀性)

I was walking (动作时间比较长)when I met him.(突兀性)

上面的句子，每局都拥有（1）verb to be 的 was , were 加 gerund 动名词 如 sleeping, enjoying, driving 和walking （2）过去式（PAST TENSE）的动词 如 knocked， shouted ，happened 和 met.

在过去进行式（Past continuous Tense）中，重点是某一事情在进行中(动作时间比较长)，突然另一事情(突兀性)发生了，出现了！